Look at an LMC catalog. They have detailed diagrams of anything youd need and you wont necissarily have to get new wheels, there are companies that make adaptors that allow you to put a six lug wheel on an eight lug hub and the other way around. And there are other combinations too.

Look at an LMC catalog. They have detailed diagrams of anything youd need and you wont necissarily have to get new wheels, there are companies that make adaptors that allow you to put a six lug wheel on an eight lug hub and the other way around. And there are other combinations too.

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X2 on LMC. And it you're looking for adapters Spidertrax is an excellent source.

Like Jacqson said that square block wont fit in the round hole.
Theres so many differences in the front suspension assemblys of the K1500 and K2500 that very few parts if any will cross over.
Besides a 2500 hub and bearing assembly wont increase weight capacity on your 1500 series truck, the only advantage if you could do it would be a slightly larger bearing surface, but since you already more than likely got a lot of miles out of the OEM bearing why would you want to spend all the money it would take to fit the parts just for slightly larger bearings that will last probably just as long.